U.S. patent application number 11/497415 was filed with the patent office on 2007-09-13 for light source installation in back light unit.
This patent application is currently assigned to K-Bridge Electronics Co., Ltd.. Invention is credited to Fang-I Chou.
Application Number | 20070211491 11/497415 |
Document ID | / |
Family ID | 37874463 |
Filed Date | 2007-09-13 |
United States Patent
Application |
20070211491 |
Kind Code |
A1 |
Chou; Fang-I |
September 13, 2007 |
Light source installation in back light unit
Abstract
A light source installation in back light unit to effectively
shorten the area required for incorporation of wavelength from each
of multiple LEDs is comprised of multiple LED units; each LED unit
being comprised of multiple LEDs; multiple LED units being disposed
on a locking member and each LED unit being disposed on a curved
section formed by the locking member and further on the incident
plane of the light guide plate in different directions; and light
emitted from those multiple LED units being mixed to incorporate
wave length from each LED into white light.
Inventors: |
Chou; Fang-I; (Yangmei
Taoyuan, TW) |
Correspondence
Address: |
TROXELL LAW OFFICE PLLC;SUITE 1404
5205 LEESBURG PIKE
FALLS CHURCH
VA
22041
US
|
Assignee: |
K-Bridge Electronics Co.,
Ltd.
|
Family ID: |
37874463 |
Appl. No.: |
11/497415 |
Filed: |
August 2, 2006 |
Current U.S.
Class: |
362/601 |
Current CPC
Class: |
G02B 6/0031 20130101;
G02B 6/0053 20130101; G02B 6/0055 20130101; G02B 6/0068 20130101;
G02B 6/0051 20130101 |
Class at
Publication: |
362/601 |
International
Class: |
F21V 7/04 20060101
F21V007/04 |
Foreign Application Data
Date |
Code |
Application Number |
Mar 8, 2006 |
TW |
095203832 |
Claims
1. A light source installation in back light unit to effectively
shorten the area required for incorporation of wavelength from each
of multiple LEDs is comprised of multiple LED units; each LED unit
being comprised of multiple LEDs; each LED unit being disposed in
various directions on the incidence plane of a light guide plate;
and wave length of each LED being incorporated into white light due
to light mixing.
2. The light source installation in back light unit as claimed in
claim 1, wherein the light source installation is adapted in a
reflective mask.
3. The light source installation in back light unit as claimed in
claim 1, wherein the light source installation is applied in a back
light unit; a reflective mask being disposed on the edge of a
display panel assembly of the back light unit; and the light source
installation being adapted in the reflective mask.
4. The light source installation in back light unit as claimed in
claim 2, wherein those multiple LEDs are disposed on the reflective
mask in different directions.
5. The light source installation in back light unit as claimed in
claim 3, wherein those multiple LEDs are disposed on the reflective
mask in different directions.
6. The light source installation in back light unit as claimed in
claim 3, wherein the display panel assembly includes light guide
plate, lower diffusion film, brightness enforcement film, upper
diffusion film, and LCD panel.
7. The light source installation in back light unit as claimed in
claim 1, wherein the light guide includes an incidence plane, a
base plane crossing the incidence plane, and an emitting plan in
opposite to the base plane.
8. The light source installation in back light unit as claimed in
claim 4, wherein a reflective film is further disposed below the
base plane of the light guide plate.
9. The light source installation in back light unit as claimed in
claim 5, wherein a reflective film is further disposed below the
base plane of the light guide plate.
10. A light source installation in back light unit to effectively
shorten the area required for incorporation of wavelength from each
of multiple LEDs is comprised of multiple LED units; each LED unit
being comprised of multiple LEDs; multiple LED units being disposed
on a locking member and each LED unit being disposed on a curved
section formed by the locking member and further on the incident
plane of the light guide plate in different directions; and light
emitted from those multiple LED units being mixed to incorporate
wave length from each LED into white light.
11. The light source installation in back light unit as claimed in
claim 10, wherein the locking member related to a reflective mask.
Description
BACKGROUND OF THE INVENTION
[0001] (a) Field of the Invention
[0002] The present invention is related to an art for the
incorporation of wavelength of each light emitting diode (LED) in a
back light unit, and more particularly, to a light source
installation adapted in the back light unit that is in simple
construction, allows easy assembly, and effectively shortens the
area needed for the wavelength incorporation of each LED.
[0003] (b) Description of the Prior Art
[0004] Generally, the white light demonstrated by a back light unit
is essentially achieved by incorporating wavelength of streams of
light respectively emitted by Red, Green, and Blue LEDs. Since
streams of light emitted by each single LED are eradiated at a
given angle as illustrated in FIG. 1(A), streams of light from each
LED 10 are incorporated to achieve mixing results. The resultant
white light mixing area A is comparatively farther away from each
LED 10 and diffusion film is used to cause streams of light from
each LED 10 to be overlapped as expected for wavelength of streams
of light from each LED are incorporated to achieve light mixing
purpose.
[0005] When streams of light of each LED 10 pass through a
diffusion film 20 as illustrated in FIG. 2, a single diffusion film
could only create once diffusion to extend the incorporation range
of light waves, i.e., the distance H1 between the light mixing area
A and each LED 10 is comparatively farther. An improvement of the
prior art takes advantage of increasing the number of the diffusion
film to shorten the incorporation range of the light waves (or
reduce the incorporation area of light waves) thus to reduce the
cost of providing associate light guide device. However, in
practice, the strict increase of the number of diffusion film to
shorten the spacing of the incorporation range of light waves of
LED is found with several drawbacks including the difficulties in
securing relative positions among the diffusion films, more tedious
and complicate in assembly process; and compromised applicability
due to that all the diffusion films must be stacked up.
[0006] Alternatively, white LED 10 may be used to forthwith create
display results of white light as illustrated in FIG. 1(B).
However, since streams of light emitted from each single LED are
eradiated at a given angle (approximately 120.degree.), the area
that streams of light emitted between two LEDs 10 is prevented from
reaching will create dark belt area B to fail uniform display of
the back light unit.
SUMMARY OF THE INVENTION
[0007] The primary purpose of the present invention is to provide
an improved structure of a light source installation applied in a
back light unit to solve those defectives found with the prior art
of incorporating wavelength of LED in the back light unit. To
achieve the purpose, the light source installation includes
multiple LEDs with each disposed on a reflective mast in different
directions and the reflective mask is disposed on the edge of the
incident plane of a light guide plate.
[0008] Wherein, those LED units disposed with each in different
direction allow streams of light from each LED to achieve light
mixing results for wavelength of each LED to be incorporated into
white light, thus to effectively shorten the incorporation area of
wavelength of each LED and facilitate upgrading the white light
quality for the entire back light unit; and more particularly, the
design of having disposed multiple LED units on the reflective mask
reduces the quantity of members required in the incorporation of
wavelength of each LED in the back light unit and simplify the
assembly art of associate members.
BRIEF DESCRIPTION OF THE DRAWINGS
[0009] FIGS. 1(A) and 1(B) are schematic views showing
incorporation of wavelength of each and all LEDs of the prior
art.
[0010] FIG. 2 is a schematic view showing a construction of the
prior art using a single diffusion film as aid to the incorporation
of wavelength from each light emitting object in its original
color.
[0011] FIG. 3 is a schematic view showing a status of the layout of
applying a light source installation in a back light unit of the
present invention.
[0012] FIG. 4 is a perspective view showing layout of LED units in
a reflective mask in the present invention.
[0013] FIGS. 5(A), 5(B), and 5(C) are schematic views showing a
construction of layout of multiple LED units in the present
invention.
[0014] FIG. 6 is a schematic view showing a construction of
incorporation of wavelength from each LED in the present
invention.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0015] Referring to FIG. 3 for the basic construction and applied
assembly method in practice of a light conductor in a light source
installation for back light unit of the present invention, the
light source installation of the present invention is essentially
applied in the display effects of the back light unit. Wherein, the
light source installation 30 is applied in a back light unit; the
edge of a display panel assembly 40 of the back light unit is
disposed with a reflective mask 50; and the light source
installation 30 is adapted to a locking member (may be related to
the reflective mask). In this preferred embodiment, the display
panel assembly 40 includes a light guide plate 41, a lower
diffusion film 42, a brightness enforcement film 43, an upper
diffusion film 44, and a liquid crystal display (LCD) 45. The light
guide plate 41 includes an incident plane 411, a base plane 412
crossing the incident plane 411, and an eradiation plane 413 in
opposite to the base plane 412; a reflective film 46 is further
disposed below the base plane 412 of the light guide plate. Streams
of light emitted from the light source installation 30 enters into
the light guide plate 41 through the incident plane 411 of the
light guide plate 41 and eradiated towards the eradiation plane 413
of the light guide plate to achieve the display results by the LCD
60. Diffusion results are further increased to achieve uniform
light emission of the light source through optical films including
the lower diffusion film 42, the brightness enforcement film 43 and
the upper diffusion film 44.
[0016] Wherein, the light source installation 30 includes multiple
LED units 31 with each unit comprised of multiple LEDs 311 as
illustrated in FIG. 4. The reflective mask 50 is formed with
multiple curved sections with each LED unit 31 disposed on the
curved section so that each LED unit 31 is provided on the
reflective mask 50 in different direction. Multiple LED units 31
are disposed on three planes of the reflective mask 50 with those
multiple LEDs 311 assigned to each LED unit 31 may be arranged in a
pattern as respectively illustrated in FIGS. 5(A), 5(B), and 5(C),
wherein an LED 311 of single color (red, green or blue) or mixed
colors are construed into the LED unit 31; or multiple white light
LEDs are forthwith provided to create white light display
results.
[0017] Accordingly, the advancing route of streams of light from
each LED unit 31 before entering into the display panel assembly 40
as illustrated in FIG. 6 indicates that streams of light emitted
from different direction by each LED 311 are mixed in a fashion
different from that observed with the flat type of the prior art.
In the present invention, streams of light emitted by LEDs 311
respectively in the direction of X, Y, and Z axles create a light
mixing area A to allow the wavelength of each LED of original color
to be incorporated into white light. Since the light mixing area A
is closer to each LED 311, it can effectively eliminate a dark belt
area B, thus to effective shorten the light mixing area for the
incorporation of wavelength of each LED 311, effectively solve the
problem of ripples found with the back light unit of the prior art,
and facilitate upgrading the quality of white light for the entire
back light unit.
[0018] Furthermore, the design of having multiple LED units
disposed on the reflective mask reduces the number of members
required for the incorporation of wavelength of each LED in the
back light unit and simplifies the assembly art of associate
members.
[0019] The prevent invention provides an improved structure of a
light source to effectively shorten area required for the
incorporation of wave length from each LED and upgrade white light
quality of a back light unit, and the application for a utility
patent is duly filed accordingly. However, it is to be noted that
the preferred embodiments disclosed in the specification and the
accompanying drawings are not limiting the present invention; and
that any construction, installation, or characteristics that is
same or similar to that of the present invention should fall within
the scope of the purposes and claims of the present invention.
* * * * *